mirror of https://github.com/python/cpython
54 lines
1.0 KiB
Python
54 lines
1.0 KiB
Python
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# Replacements for getevent() and pollevent(),
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# and new functions ungetevent() and sync().
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# Every library module should ideally use this instead of
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# stdwin.{get,poll}event(), so applications can use the services
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# of ungetevent() and sync().
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import stdwin
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# Events read ahead are stored in this queue.
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#
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queue = []
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# Replacement for getevent().
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#
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def getevent():
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if queue:
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event = queue[0]
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del queue[0]
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return event
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else:
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return stdwin.getevent()
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# Replacement for pollevent().
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#
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def pollevent():
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if queue:
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return getevent()
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else:
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return stdwin.pollevent()
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# Push an event back in the queue.
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#
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def ungetevent(event):
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queue.insert(0, event)
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# Synchronize the display. It turns out that this is the way to
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# force STDWIN to call XSync(), which some (esoteric) applications need.
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# (This is stronger than just flushing -- it actually waits for a
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# positive response from the X server on the last command issued.)
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#
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def sync():
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while 1:
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event = stdwin.pollevent()
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if not event: break
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queue.append(event)
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